Backend versions are specified in
a <replaceable>major.minor</replaceable> format. The minor
number is increased when there are backward compatibile changes
- introduced. For example, ithe addition of a new index. It is
+ introduced. For example, the addition of a new index. It is
desirable, but not mandatory to to apply such a change; you
can run on older database version if you want to. (Although, in
the example given, running without the new index may be at the